[PATCH] D134463: [AMDGPU] Use V_PERM to match buildvectors when inputs are not canonicalized (i.e. can't use V_PACK)

[Jay Foad via Phabricator via llvm-commits]

foad added a comment.

Can't you use v_alignbit for all the cases where you need the upper 16 bits of one register and the lower 16 bits of the other? It should be smaller than v_perm because the shift amount (16) is an inline constant.


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  https://reviews.llvm.org/D134463/new/

https://reviews.llvm.org/D134463